@Override
          public TreeMap<Integer, Character> get() {
            return Maps.newTreeMap();
          }
        };
    Map<String, Map<Integer, Character>> backingMap = Maps.newLinkedHashMap();
    Table<String, Integer, Character> table = newCustomTable(backingMap, factory);
    populate(table, data);
    return table;
  }

  public void testRowKeySetOrdering() {

  public static class ImmutableBiMapCopyOfGenerator extends TestStringBiMapGenerator {
    @Override
    protected BiMap<String, String> create(Entry<String, String>[] entries) {
      Map<String, String> builder = Maps.newLinkedHashMap();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return ImmutableBiMap.copyOf(builder);
    }
  }

    assertEquals("", j.join(ImmutableMap.of()));
    assertEquals(":", j.join(ImmutableMap.of("", "")));

    Map<@Nullable String, @Nullable String> mapWithNulls = Maps.newLinkedHashMap();
    mapWithNulls.put("a", null);
    mapWithNulls.put(null, "b");

    assertThrows(NullPointerException.class, () -> j.join(mapWithNulls));

  public static class ImmutableBiMapCopyOfGenerator extends TestStringBiMapGenerator {
    @Override
    protected BiMap<String, String> create(Entry<String, String>[] entries) {
      Map<String, String> builder = Maps.newLinkedHashMap();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return ImmutableBiMap.copyOf(builder);
    }
  }

  }

  public static class ImmutableMapCopyOfGenerator extends TestStringMapGenerator {
    @Override
    protected Map<String, String> create(Entry<String, String>[] entries) {
      Map<String, String> builder = Maps.newLinkedHashMap();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return ImmutableMap.copyOf(builder);
    }
  }

    underlying.clear();
    assertEquals(underlying.size(), map.size());
  }

  public void testTransformChangesAreReflectedInUnderlyingMap() {
    Map<String, Integer> underlying = Maps.newLinkedHashMap();
    underlying.put("a", 1);
    underlying.put("b", 2);
    underlying.put("c", 3);
    underlying.put("d", 4);
    underlying.put("e", 5);
    underlying.put("f", 6);
    underlying.put("g", 7);

        return Maps.newHashMap(map);
      }
    },
    LinkedHashMapImpl {
      @Override
      public <K extends Comparable<K>, V> Map<K, V> create(Map<K, V> map) {
        return Maps.newLinkedHashMap(map);
      }
    },
    ConcurrentHashMapImpl {
      @Override
      public <K extends Comparable<K>, V> Map<K, V> create(Map<K, V> map) {
        return new ConcurrentHashMap<>(map);
      }
    },

    underlying.clear();
    assertEquals(underlying.size(), map.size());
  }

  public void testTransformChangesAreReflectedInUnderlyingMap() {
    Map<String, Integer> underlying = Maps.newLinkedHashMap();
    underlying.put("a", 1);
    underlying.put("b", 2);
    underlying.put("c", 3);
    underlying.put("d", 4);
    underlying.put("e", 5);
    underlying.put("f", 6);
    underlying.put("g", 7);

        return Maps.newHashMap(map);
      }
    },
    LinkedHashMapImpl {
      @Override
      public <K extends Comparable<K>, V> Map<K, V> create(Map<K, V> map) {
        return Maps.newLinkedHashMap(map);
      }
    },
    ConcurrentHashMapImpl {
      @Override
      public <K extends Comparable<K>, V> Map<K, V> create(Map<K, V> map) {
        return new ConcurrentHashMap<>(map);
      }
    },

    assertEquals(Collections.<Integer, String>emptyMap(), bimap.inverse());
  }

  public void testFromHashMap() {
    Map<String, Integer> hashMap = Maps.newLinkedHashMap();
    hashMap.put("one", 1);
    hashMap.put("two", 2);
    ImmutableBiMap<String, Integer> bimap = ImmutableBiMap.copyOf(hashMap);
    assertMapEquals(bimap, "one", 1, "two", 2);